[ms02 title]

INDEX  ^

1) Introduction
2) Advantages of using the Korg system
[bullet] Specific differences between the two systems
3) Features and Functions
4) Using the Interface
5) Caution
6) For more accurate tuning
7) Specifications


1) Introduction  ^

"For complete connection compatibility between synthesizers.
The MS-02 is ideal if you want to upgrade your synthesizer by adding on other synthesizer units having different kinds of keyboard control voltage and trigger signals. The built-in, fully adjustable log amp, anti-log amp, and trigger processor ensure complete system flexibility and compatibility between any presently voltage controlled synthesizer."


Thankyou for choosing Korg equipment. In order to get the most out of your new MS-02, please read this owner's manual carefully before use.

The Korg Interface MS-02 is designed for the purpose of connecting Korg MS-Series synthesizers with other synthesizers available throughout the world. This sophisticated signal processor greatly enhances the performance possibilities of the MS-Series.

Among presently available music synthesizers, there are two different types of control system used for the VCO (voltage controlled oscillator) and EG (envelope generator). One of these systems is used by Korg and Yamaha; the other is employed by every other synthesizer manufacturer. The Korg MS-02 provides you with a way to change the control signals of one system into the control signals used in the other system. In this way, it acts as an interface so that any two synthesizers can be used together, provided that the synthesizers are equipped with the conventional input and output jacks for control voltage and trigger or gate signals.


2) Advantages of the Korg system  ^

In the Korg Hz/V system, the VCO oscillator frequency is proportional to the control voltage. Other synthesizers employ the OCT/V system, in which the oscillator frequency changes one octave for every one volt (1V) change in the control voltage. Since an increase of one octave means that the frequency is doubled, each increase of one volt in the control voltage means a doubling of VCO frequency.

The problem with the OCT/V system, used by every manufacturer except Korg and Yamaha, is that it must employ a log amp in order to double the frequency for each one volt increase in the control voltage. Log amp circuitry is unfortunately very unstable because of its sensitivity to temperature changes. This causes so many problems that most professional musicians automatically assume that synthesizers always have unstable pitch. When we developed out first Korg synthesizer, we decided that such a circuit was entirely unsuitable for a musical instrument. So, instead we invented our own unique, patented circuit in which the keyboard voltage (which is the VCO control voltage) itself doubles for each one octave increase in pitch.

EG control is also simplified in the Korg system.
For the trigger signal (also called a "gate" signal) that is used to start EG operation, Korg uses a simple switch and 2p phone plug connection instead of the special plugs and switches needed for the " [ground 1] " type of system.
The " [ground 2] " type of system used by Korg also makes it easy to use microcomputers to control the synthesizer.

[bullet] Specific differences between the two systems  ^

The graph in Figure 1 below shows the relationship between the VCO oscillator frequency (pitch) and the control voltage (keyboard output voltage). The straight line on the graph is from a synthesizer in which there is a one octave change for every one volt change in the control voltage. In other words, a one volt rise in voltage produces a one octave rise in pitch (OCT/V system).

In contrast, the curved line on the graph is the control voltage from the keyboard of a Korg or Yamaha synthesizer in which VCO frequency is proportional to voltage (Hz/V system). Note that the voltage doubles for each octave rise in pitch. The difference between the trigger (gate) signals of the two systems is clearest if you think of the trigger as a switch. In the lower diagram below is shown the Korg system ( [ground 2] ) of switching on EG operation (initiating operation), and the means by which the other system ( [ground 1] ) accomplishes the same thing. In the ( [ground 2] ) system, only two lines are needed to connect the switch to the EG. In the ( [ground 1] ) system, either three lines, or the addition of a battery to the switch is required.

[figure]
- logarithmic versus linear cv systems

[trigger types]
- trigger types


3) Features and Functions  ^


4) Using the Interface  ^


6) Caution  ^

(1) Before using the Log Amp or Anti Log Amp sections, turn on the MS-02 and let it warm up for about 10 minutes.
(2) Since the MS-02 output may be affected by ambient temperature changes, avoid using near heating or cooling units.


6) For more accurate tuning  ^

For the most precise tuning results when using the MS-02 Log Amp and Anti Log Amp, we recommend the Korg Tuning Standard WT-10A.
The WT-10A employs a meter to tell you at a glance whether pitch is accurate or not.

[wt10a tuner]
The Korg WT-10A tuner


Specifications ^

1. LOG AMPLIFIER [bullet] Tuning
[bullet] Width
[bullet] Hz/V input (0~15V)
[bullet] Oct/V Output (-12V~+12V)
2. ANTILOG AMPLIFIER [bullet] Tuning
[bullet] Width
[bullet] Oct/V input (-4V~+4V)
[bullet] Hz/V output (-12V~+12V)
3. ADDING AMPLIFIER [bullet] Channel 1 level control
[bullet] Channel 2 level control
[bullet] Input Channel 1
[bullet] Input Channel 2
[bullet] Output
4. TRIGGER PROCESSORS x 2 [bullet] Trigger indicator
[bullet] Reverse switch
[bullet] Input (Vth=+2.5V)
[bullet] Output (0V~+15V)
5. OTHERS [bullet] Power switch
[bullet] Pilot lamp
6. JUNCTIONS [bullet] 4 x 2
[bullet] 3 x 1
7. DIMENSIONS [bullet] 283 (W) X 110 (H) X 195 (D) mm
8. WEIGHT [bullet] 2.2kg
9. POWER CONSUMPTION [bullet] Voltage (local voltage, 50/60Hz), wattage (5W)



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